Band-Limited Operational Amplifier

A bandwidth-limited operational amplifier model.

band limited operational amplifier

Description

The Band-Limited Operational Amplifier block models a band-limited operational amplifier. If the voltages on the positive and negative ports are and respectively, the output voltage is:

where

- gain;
- output impedance;
- output current;
- Laplace operator;
- 3 dB bandwidth.

The input current is:

where is the input resistance.

Ports

Conserving

# + — non-inverting input
electricity

Details

A non-directional port associated with the non-inverting input of an operational amplifier.

Program usage name

p

# - — inverting input
electricity

Details

A non-directional port associated with the inverting input of an operational amplifier.

Program usage name

n

# OUT — output voltage
electricity

Details

A non-directional port associated with the output voltage of an operational amplifier.

Program usage name

output_pin

Parameters

# Gain, A — open-circuit gain

Details

The open-circuit gain of an operational amplifier.

Default value	`1000.0`
Program usage name	`gain`
Evaluatable	Yes

# Input resistance, Rin — input impedance
Ohm | GOhm | MOhm | kOhm | mOhm

Details

The resistance at the input of the operational amplifier that the block uses to calculate the input current.

Values	`Ohm` \| `GOhm` \| `MOhm` \| `kOhm` \| `mOhm`
Default value	`1e6 Ohm`
Program usage name	`R_input`
Evaluatable	Yes

# Output resistance, Rout — output impedance
Ohm | GOhm | MOhm | kOhm | mOhm

Details

The resistance at the output of the operational amplifier that the block uses to calculate the output voltage drop according to the output current value.

Values	`Ohm` \| `GOhm` \| `MOhm` \| `kOhm` \| `mOhm`
Default value	`100.0 Ohm`
Program usage name	`R_output`
Evaluatable	Yes

# Minimum output, Vmin — minimum output voltage
V | MV | kV | mV

Details

The lower limit of the idle output voltage of an operational amplifier.

Values	`V` \| `MV` \| `kV` \| `mV`
Default value	`-15.0 V`
Program usage name	`V_min`
Evaluatable	Yes

# Maximum output, Vmax — maximum output voltage
V | MV | kV | mV

Details

The upper limit of the idle output voltage of an operational amplifier.

Values	`V` \| `MV` \| `kV` \| `mV`
Default value	`15.0 V`
Program usage name	`V_max`
Evaluatable	Yes

# Maximum slew rate, Vdot — maximum output voltage slew rate
V/s | V/us

Details

The maximum positive or negative rate of change of the output voltage amplitude.

Values	`V/s` \| `V/us`
Default value	`1000.0 V/s`
Program usage name	`max_slew_rate`
Evaluatable	Yes

# Bandwidth, f — open-circuit bandwidth
Hz | GHz | MHz | kHz

Details

The open-circuit bandwidth, i.e. the frequency at which the gain drops by 3 dB compared to the low-frequency gain .

Values	`Hz` \| `GHz` \| `MHz` \| `kHz`
Default value	`1e5 Hz`
Program usage name	`f_cutoff`
Evaluatable	Yes

# Initial output voltage, V0 — initial output voltage
V | MV | kV | mV

Details

Output voltage at the beginning of the simulation when the output current is zero.

*Note

This parameter does not take into account the voltage drop across the output resistor.

Values	`V` \| `MV` \| `kV` \| `mV`
Default value	`0.0 V`
Program usage name	`v_internal_start`
Evaluatable	Yes